BusState.cc

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/*
    Copyright (c) 2002-2009 Tampere University.
 
    This file is part of TTA-Based Codesign Environment (TCE).
 
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/**
 * @file BusState.cc
 *
 * Definition of BusState class.
 *
 * @author Jussi Nyk�nen 2004 (nykanen-no.spam-cs.tut.fi)
 * @author Pekka J��skel�inen 2005 (pjaaskel-no.spam-cs.tut.fi)
 * @note rating: red
 */
 
#include "BusState.hh"
#include "Application.hh"
#include "SimValue.hh"
#include "BaseType.hh"
 
using std::string;
 
//////////////////////////////////////////////////////////////////////////////
// BusState
//////////////////////////////////////////////////////////////////////////////
 
/**
 * Constructor.
 *
 * @param width Bit width of the bus.
 */
BusState::BusState(int width) : 
    RegisterState(width), squashed_(false) {
}
 
/**
 * Destructor.
 */
BusState::~BusState() {
}
 
/**
 * Sets the value of the bus.
 *
 * Does not extend the value.
 *
 * @param value New value.
 */
void
BusState::setValue(const SimValue& value) {
    RegisterState::setValue(value);
}
 
/**
 * Sets whether the last executed move scheduled to this bus was squashed.
 *
 * @param isSquashed True in case this bus was squashed.
 */
void 
BusState::setSquashed(bool isSquashed) {
    squashed_ = isSquashed;
}
 
/**
 * Returns true if the last executed move scheduled to this bus was squashed.
 *
 * @param isSquashed True in case this bus was squashed.
 */
bool 
BusState::isSquashed() const {
    return squashed_;
}
 
/**
 * Returns width of the modeled bus.
 */
int
BusState::width() const {
    return value().width();
}
 
//////////////////////////////////////////////////////////////////////////////
// NullBusState
//////////////////////////////////////////////////////////////////////////////
 
NullBusState* NullBusState::instance_ = NULL;
 
/**
 * Returns the instance of NullBusState.
 *
 * @return The instance of NullBusState.
 */
NullBusState&
NullBusState::instance() {
    if (instance_ == NULL) {
        instance_ = new NullBusState();
    }
    return *instance_;
}
 
/**
 * Constructor.
 */
NullBusState::NullBusState() : BusState(0) {
}
 
/**
 * Destructor.
 */
NullBusState::~NullBusState() {
}
 
/**
 * Aborts the program with error message.
 */
void
NullBusState::setValue(const SimValue&) {
    Application::abortWithError("setValue()");
}
 
/**
 * Aborts the program with error message.
 *
 * @return Never returns.
 */
const SimValue&
NullBusState::value() const {
    Application::abortWithError("value()");
    return NullSimValue::instance();
}